/*
 * Copyright 2022-2025 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.yingzhuo.turbocharger.redis.lock;

import org.springframework.lang.Nullable;

import java.io.Serializable;
import java.util.Stack;

/**
 * 锁栈
 *
 * @author 应卓
 * @see DistributedReentrantLock
 * @since 3.4.0
 */
public final class LockStack implements Serializable {

	private final Stack<LockFrame> frames = new Stack<>();

	/**
	 * 默认构造方法
	 */
	public LockStack() {
		super();
	}

	public void push(LockFrame lockFrame) {
		frames.push(lockFrame);
	}

	@Nullable
	public LockFrame pop() {
		return isEmpty() ? null : frames.pop();
	}

	@Nullable
	public LockFrame peek() {
		return isEmpty() ? null : frames.peek();
	}

	public boolean isEmpty() {
		return frames.isEmpty();
	}

}
